\ alyzing a common mistake. Question: The still water velocity of a boat is 5 ml s. At what angle must this boat point upstream so that it lands directly across the river? The current is moving at 3 mls. a. The most common incorrect answer for this type of question is 31" (from a line perpendicular to the shore). Show a fully labelled vector diagram that illustrates how this answer was achieved. Circle the mistake and briefly discuss the incorrect assum ption that led to this solution. b. The actual answer is 36.9" . Show a fully labelled vector diagram that illustrates how this answer was achieved. The kinematic equation 0' 2 VI is used in conjunction with relative velocity questions. Explain why :he other kinematic equations are not useful for most relative velocity questions. Two swimmers of identical ability want to race across a river. The goal is to touch the other side First (anywhere along the bank). Both swimmers can swim at a rate of Soils in still water. The river's current is 3m/s. Swimmer A points upstream so that she ends up travelling straight across :he river along a line perpendicular to the point on the shore where she started. Swimmer B points directly across and ends up downstream due to the river's current. a. Which swimmer makes it across first? Why do you think this is so? b. Ifthe river is 50m wide determine the time it takes for each swimmer to cross. 0. Using swimmer B above solve for the following: Construct the equivalent displacement vector diagram and label all sides and angles with correct values. Use the equation d = vt and solve for t in each direction (i.e time to travel downstream, time to travel diagonally}